40 



The attention of Mr. Paris was called to a certain disease of 

 ferns which was proving injurious to some of the Boston fern 

 mutants of Dr. Benedict. He has succeeded in demonstrating that 

 a hitherto undescribed species of Glomcrclla is the cause of the 

 disease, and has prepared a paper which describes the symptoms 

 of the disease and the causal organism, and has suggested methods 

 of control. This paper will appear in an early number of 

 Mycologia. 



Miss Dorothy P. Tuthill completed in May her work on the 

 problem which served as the basis of her thesis. She prepared a 

 report on various diseases of ornamental plants, describing the 

 causal organisms of these diseases, the pathological effects on the 

 host, and the recommended methods of control. Her thesis was 

 accepted in partial fulfilment of the requirement for the degree of 

 Master of Arts by New York University. 



Forest Pathology 



Dr. Graves, Curator of Public Instruction, has continued his 

 investigations in the diseases of forest trees. A study beeun 

 more than four years ago, of a serious disease of the butternut and 

 Japanese walnut which is also significant in its possible relations 

 to other species of walnut, is now completed. In a paper soon to 

 be published, the nature of this trouble is set forth for the first 

 time and remedies are prescribed. The fungus associated with 

 the disease has been carefully studied and two forms which had 

 passed as different species are now proved, by cultural methods, 

 to be one and the same. 



In connection with his position as collaborator in the Office 

 of Investigations in Forest Pathology, Bureau of Plant Industry, 

 U. S. Department of Agriculture, Dr. Graves has, during the past 

 year, advanced his work on resistance to the destructive chestnut 

 bark disease. Trees of American chestnut which were resistant 

 to the disease were discovered by him in the neighborhood of 

 New York in 191 8. With a view to securing a resistant strain 

 for planting purposes it is planned to cross these resistant New 

 York trees with resistant Chinese and Japanese stock. 



